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package cgroups
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
)
type cpuHandler struct {
}
func getCPUHandler() *cpuHandler {
return &cpuHandler{}
}
func cleanString(s string) string {
return strings.Trim(s, "\n")
}
func readAcct(ctr *CgroupControl, name string) (uint64, error) {
p := filepath.Join(ctr.getCgroupv1Path(CPUAcct), name)
return readFileAsUint64(p)
}
func readAcctList(ctr *CgroupControl, name string) ([]uint64, error) {
var r []uint64
p := filepath.Join(ctr.getCgroupv1Path(CPUAcct), name)
data, err := ioutil.ReadFile(p)
if err != nil {
return nil, errors.Wrapf(err, "reading %s", p)
}
for _, s := range strings.Split(string(data), " ") {
s = cleanString(s)
if s == "" {
break
}
v, err := strconv.ParseUint(s, 10, 0)
if err != nil {
return nil, errors.Wrapf(err, "parsing %s", s)
}
r = append(r, v)
}
return r, nil
}
// Apply set the specified constraints
func (c *cpuHandler) Apply(ctr *CgroupControl, res *spec.LinuxResources) error {
if res.CPU == nil {
return nil
}
return fmt.Errorf("cpu apply not implemented yet")
}
// Create the cgroup
func (c *cpuHandler) Create(ctr *CgroupControl) (bool, error) {
if ctr.cgroup2 {
return false, fmt.Errorf("cpu create not implemented for cgroup v2")
}
return ctr.createCgroupDirectory(CPU)
}
// Destroy the cgroup
func (c *cpuHandler) Destroy(ctr *CgroupControl) error {
return os.Remove(ctr.getCgroupv1Path(CPU))
}
// Stat fills a metrics structure with usage stats for the controller
func (c *cpuHandler) Stat(ctr *CgroupControl, m *Metrics) error {
var err error
usage := CPUUsage{}
if ctr.cgroup2 {
values, err := readCgroup2MapFile(ctr, "cpu.stat")
if err != nil {
return err
}
if val, found := values["usage_usec"]; found {
usage.Kernel, err = strconv.ParseUint(cleanString(val[0]), 10, 0)
if err != nil {
return err
}
}
if val, found := values["system_usec"]; found {
usage.Total, err = strconv.ParseUint(cleanString(val[0]), 10, 0)
if err != nil {
return err
}
}
// FIXME: How to read usage.PerCPU?
} else {
usage.Total, err = readAcct(ctr, "cpuacct.usage")
if err != nil {
return err
}
usage.Kernel, err = readAcct(ctr, "cpuacct.usage_sys")
if err != nil {
return err
}
usage.PerCPU, err = readAcctList(ctr, "cpuacct.usage_percpu")
if err != nil {
return err
}
}
m.CPU = CPUMetrics{Usage: usage}
return nil
}
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